Many Body is the New Three-Body:
Fluctuating hydrodynamics theory could describe chaotic many-body systems, study suggests
Sep 2024, phys.org
"The entire behavior of a system may be determined by a single quantity: the diffusion constant - even though the physics are very complex and chaotic at the microscopic level." This is similar to how we measure the randomness of fluctuating hydrodynamics.The team prepared a quantum system of ultracold cesium atoms in optical lattices in a non-equilibrium initial state and then let it evolve freely, so they could measure it. They found that despite their microscopic complexity, these systems can be described simply as a macroscopic diffusion process - similar to Brownian motion.
via Ludwig Maximilian University of Munich: Julian F. Wienand et al, Emergence of fluctuating hydrodynamics in chaotic quantum systems, Nature Physics (2024). DOI: 10.1038/s41567-024-02611-z
Totally unrelated image credit: SARS-CoV-2 blocking expression of interferons - NIAD NIH - Aug 2024
Researcher discusses a new type of collective interference effect
Sep 2024, phys.org
In our interference scenario, the particles' entanglement bridges the spatial gap between separate interferometers, introducing an interference pattern that depends on the overall quantum state of all the particles involved, and is inaccessible when one or more particles are excluded from the dynamics.
So interference patterns are influenced not only by the quantum states of the individual particles but also by the entanglement shared among some of them (like the total state).
via Department of Experimental Physics at University of Innsbruck, University of Freiburg, and Heriot-Watt University UK: Tommaso Faleo et al, Entanglement-induced collective many-body interference, Science Advances (2024). DOI: 10.1126/sciadv.adp9030
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